This might sound familiar: A treasure hunter says he's found something intriguing hidden beneath the earth by the Nazis in Poland. Except this isn't about a nearly mythical "gold train" that has set off frenzied search in the city of Walbrzych. Instead, Krzysztof Szpakowski says he's found a large underground complex at a separate location nearby, which he believes was built by the Nazis as a shelter in case of a nuclear bomb, reports AP. Szpakowski says it's part of a network of largely unexplored underground tunnels built in the region by the Germans—or, more precisely, by their forced laborers—before the end of the war. "The Nazis built a whole underground city in this region with an area of (500 acres) ... that was supposed to allow Hitler's inner circle to survive for a couple of years in case of an atomic attack," says Szpakowski.
He produced images from ground-penetrating radar suggesting two tunnels and "an object that looked like a barrel or canister," reports CNBC—in other words, a possible train. Szpakowski says that it would be "irresponsible" to suggest it held gold, but added that military equipment and construction material were likely, reports AFP. He seems to have convinced Walbrzych officials that something is down there, because they promised to help with the hunt, which will require explosives and professional digging equipment. Szpakowski says he's been picking away at this for decades and decided to come forward given the publicity surrounding the "gold train." (The two men who claim to have located it say a deathbed confession resulted in their map.)